// Copyright (C) 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"flag"
	"fmt"
	"os"

	"github.com/google/gapid/core/app"
	"github.com/google/gapid/core/log"
)

func init() {
	verb := &app.Verb{
		Name:       "cat",
		ShortHelp:  "Prints data out of a .perfz file",
		Run:        catVerb,
		ShortUsage: "<perfz> [[benchmark]:[link]]",
	}
	app.AddVerb(verb)
}

func catVerb(ctx log.Context, flags flag.FlagSet) error {
	if flags.NArg() < 1 {
		app.Usage(ctx, "At least one argument expected, got %d", flags.NArg())
		return nil
	}

	perfzFile := flags.Arg(0)
	perfz, err := LoadPerfz(ctx, perfzFile, flagVerifyHashes)
	if err != nil {
		return err
	}

	if flags.NArg() == 1 {
		fmt.Println(perfz.String())
		return nil
	} else {
		_, link, err := selectLink(perfz, flags.Arg(1), nil)
		if err != nil {
			return err
		}
		return link.Get().WriteTo(os.Stdout)
	}
}
